Formal

• Acetal
• Ancient Greek
• Dimethoxymethane
• Dynamic and formal equivalence
• Form (disambiguation)
• Formal (university)
• Formal calculation
• Formal cause
• Formal concentration
• Formal derivative
• Formal fallacy
• Formal grammar
• Formal language
• Formal logic
• Formal methods
• Formal power series
• Formal proof
• Formal specification
• Formal system
• Formal theory (disambiguation)
• Formal verification
• Formal wear
• Formalism (disambiguation)
• Informal attire
• Informal education
• Informal fallacy
• Informal logic
• Informal mathematics
• Informal sector
• Informal settlement
• Informal social control
• Informal value transfer system
• Informal vote
• Ketal
• MV Formality
• Naive set theory
• Pro forma
• School formal
• Semi-formal attire
• T–V distinction
• formality
• set theory
• substantial form